• Mustang Forums
  • 2005 - 2014 S-197 Mustang -General/Talk-
  • 2005 - 2009 Specific Tech

Revvs like heck on startup?

  • Thread starter Thread starter 06GTVert
  • Start date Start date Oct 9, 2005
0

06GTVert

New Member
Aug 11, 2005
8
0
0
Oct 9, 2005
#1
  • Oct 9, 2005
  • #1
My 06 really revvs high when starting cold. It is quite annoying. Runs up over 2000 RPM, and hangs there a few seconds then slowly comes down. Is this normal, can a tune fix it? And I'm in Texas, so what I mean when I say start cold, is like 70 degrees.
 

AznStanger3v

Active Member
Aug 11, 2003
2,026
0
47
Northern VA
Oct 9, 2005
#2
  • Oct 9, 2005
  • #2
thats normal
 

Roni

someone needs to pimp my ass
Mar 30, 2005
0
0
16
Edmonton, Alberta
Oct 10, 2005
#3
  • Oct 10, 2005
  • #3
It does that on my '05. It does it on initial start whether its cold outside or not.
 
R

RICVA05

New Member
Apr 21, 2005
66
0
0
Oct 10, 2005
#4
  • Oct 10, 2005
  • #4
Tune does not make a difference it still revs high at start up.
 

willys1

Active Member
Dec 2, 2003
1,004
1
36
New Jersey
Oct 10, 2005
#5
  • Oct 10, 2005
  • #5
I would get a nice set of mufflers so you wake the nieghbors in the morning
 
D

delurker

New Member
Apr 15, 2005
169
0
0
Oct 11, 2005
#6
  • Oct 11, 2005
  • #6
Jeez! I never noticed mine doing this until after I got a custom tune (after long-tube headers, among other things) - I thought it was the tune causing it, but I guess I only noticed it because my exhaust is louder.
 
A

Asad_

New Member
Aug 29, 2005
3
0
0
Oct 11, 2005
#7
  • Oct 11, 2005
  • #7
It's slowly warming up the oil, and circulating it through the top end.
 

ArchNemesis

Founding Member
Aug 31, 2000
171
0
0
San Diego CA
Oct 11, 2005
#8
  • Oct 11, 2005
  • #8
every mustang I have ever owned has done this, it is not a problem. i am sure every car does this you just don't notice it...probably due to the V8 and the fact that the car is loud, it makes the revving more noticeable on startup.
 

hotrodnut

Member
Jul 12, 2004
672
0
17
North Florida
Oct 11, 2005
#9
  • Oct 11, 2005
  • #9
My '03 does the same thing, if I haven't started it up in a while it will rattle at first due to the oil starvation at start up. So, if it's been awhile since I've started it, I'll just bump the starter without starting it and then hit it again and when it lights off it doesn't rev over 1400-1500 rpms. My Sons '04 doesn't rev past 1400 rpms at start up and nor does my 4.6 '04 truck, actually about 1200-1300 on it. I test drove other trucks before the one I got and some of those reved over 2200 on start up and some didn't???? It seems to me it should be able to be tuned out by someone with the proper equipment and knowledge.
 

JTGrant

New Member
Aug 2, 2005
775
0
0
GA
Oct 11, 2005
#10
  • Oct 11, 2005
  • #10
its normal it is for getting oil quickly to the valvetrain and heating the cat.
 

351CJ

New Member
Dec 11, 2002
1,732
1
0
Oct 11, 2005
#11
  • Oct 11, 2005
  • #11
The high revs on start up is to heat up the cats. fast to reduce emissions. This is required for a ULEV-II vehicle, which the 05 - 06 Mustang is.
 

willys1

Active Member
Dec 2, 2003
1,004
1
36
New Jersey
Oct 11, 2005
#12
  • Oct 11, 2005
  • #12
I would bring it too the dealer.1500 or lower is normal,over 2000rpm does seem a little high.
 

JTGrant

New Member
Aug 2, 2005
775
0
0
GA
Oct 11, 2005
#13
  • Oct 11, 2005
  • #13
Normal!!
 

willys1

Active Member
Dec 2, 2003
1,004
1
36
New Jersey
Oct 11, 2005
#14
  • Oct 11, 2005
  • #14
JTGrant said:
Normal!!
Click to expand...
its border line,its a little high for a rotating assembly that has no lubrication in it yet.
 
You must log in or register to reply here.

Similar threads

7
Engine Random hanging idle
  • 706 Saleen
  • Feb 11, 2026
  • Fox 5.0 Mustang Tech
Replies
9
Views
665
Fox 5.0 Mustang Tech Feb 19, 2026
86HO5.0
8
K
Engine 2000 Mustang GT - Fuel issue post-blown spark plug repair
  • kenster1092
  • Feb 26, 2026
  • SN95 4.6L Mustang Tech
Replies
4
Views
379
SN95 4.6L Mustang Tech Mar 10, 2026
kenster1092
K
Hard to start when engine is cold
  • 86_Capri
  • Mar 11, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
32
Views
1K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 21, 2026
CAMTWO1070
Engine Surging idle on start-up
  • keel
  • Aug 11, 2025
  • Fox 5.0 Mustang Tech
Replies
16
Views
937
Fox 5.0 Mustang Tech Oct 31, 2025
keel
Tips for WUE and ASE tuning
  • Mustang5L5
  • Oct 9, 2025
  • Digital Self-tuning Forum
Replies
1
Views
573
Digital Self-tuning Forum Oct 10, 2025
gkomo
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 2005 - 2014 S-197 Mustang -General/Talk-
  • 2005 - 2009 Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?